| 16 - amplitude |
| 10 - concave |
| 17 - convex |
| 18 - opaque |
| 21 - laser |
| 8 - Radio |
| 14 - transparent |
| 9 - transverse |
| 11 - reflection |
| 3 - crest |
| 20 - trough |
| 5 - reflect |
| 13 - light |
| 15 - wavelength |
| 4 - focal point |
| 2 - translucent |
| 6 - refraction |
| 1 - Electromagnetic spectrum |
| 12 - spectrum |
| 19 - refract |
| 7 - prism |
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